Tiggr – Creating Prototypes Collaboratively

The idea behind Tiggr is to give you the resources needed to create prototypes (for web, app or mobile) that look and feel like the final product. It allows you to design from a large number of components, share (via email, Twitter or Facebook), you can collaborate with any number of users and will generate an HTML/JS/CSS so that you can preview your UI mockups very quickly. A 10 second registration (email & password) is the only thing you have to go through to use this fantastic FREE tool.